The Principles of Amplitude Modulation and Demodulation

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Table of Content Abstract………………………………………………………………………………………2 Introduction………………………………………………………………………………….3 History………………………………………………………………………………..3 Amplitude Modulation……………………………………………………………….4 Theory…………………………………………………………………………………6 Amplitude Demodulation…………………………………………………………….8 Other Concepts…………………………………………..........................................9 Advantages of Amplitude Modulation………………………………..…………….10 Disadvantages of Amplitude Modulation…………………………………………....10 Procedure 1……………………………………………………………………………….….12 Procedure 2………………………………………………………………………..…………17 Procedure 3……………………………………………………………………..……………22 Conclusion……………………………………………………………………..…………….27 References………………………………………………………………………..………….29 1 Project Abstract The purpose of this lab report is to verify the principles of Amplitude modulation and demodulation using mathematical software called Matlab. To reach these verifications, three objectives should be met. The first objective is recognizing a message signal, a carrier signal and an AM modulated waveform. Secondly, we come to measure the modulation index of an AM signal. Finally, we do study the frequency spectrum of an AM signal. Amplitude modulation or AM is a term used in electronics. This term is commonly used for conveying information via radio carrier wave. The three components of modulation are upper side band, lower side band and carrier. The combination of these elements produces different types of amplitude modulation which has various properties for transfer of information. 2 Introduction During processing Amplitude modulation and demodulation, some concepts and keywords should be defined in order to get a clearer idea about the lab report. We give a full definition of Amplitude modulation or AM as well as its history and the way it works. AM means amplitude modulation, is a form of modulation that is used for radio transmissions and

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